Charles e



(No Model.)

0. E SORIBNER. ELEUTROMAGNETIG SIGNAL.

No. 544,387. Patented Aug. 13,1895.

Mizeaws:

UNITED STATES PATENT OFFICE,

CHARLES E. SCRIBNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE WESTERN ELECTRIC COMPANY, OF SAME PLACE.

ELECTROMAGNETIC SIGNAL.

SPECIFICATION forming part of Letters Patent No. 544,387, dated August 13, 1895.

Application filed January 8, 1895. Serial No. 534,210. (No model.)

To aZZ whom it may concern.- opening of the helix and carry upon their Be it known that I, CHARLES E. SORIBNER, ends, respectively, the targets and d. The a citizen of the United States, residing at Chistrips normally rest so that target d covers 55 cago, in the county of Cook and State of Illitarget 0', the target (1 alone being visible.

5 nois, have invented a certain new and use When a current traverses the helix a, a magful Improvement in Electromagnetic Signals, netic field is produced which separates the (Case No. 371,) of which the following is a strips 0 and d, as shown in Figs, 2 and 3, both full, clear, concise, and exact description, reftargets being thus disclosed to view. WVhen 60' erence being had to theaccompanying drawthe helix is de-energized, the strips return to ings, forming a part of this specification. their normal positions. By this construction My invention relates to an electromagnetic the movable parts are reduced to a minimum signal, and its object is to produce a signaland'these such as do not require the employing device or ann unciator which may be of ment of pivoted parts. As there is very lit- 65 the simplest construction, possess no pivoted tle metal forming the core of the helix, the

r 5 parts to get out of order, and which shall offer inductive effect offered to the passage of the a low self-induction to the current. Y current is very small. The low self-induct- In the preferred form of my invention I ance of the signal renders it particularly approvide a solenoid or helix of wire, through plicable for telephone annunciators, espe- 70 the opening of which extend two thin paralcially Where the annunciator is to remain in lel strips of soft iron supported at one end, series in the talking-circuit, as thereby but each strip carrying upon its opposite end a slight resistance is offered to the passage of target of characteristic color. When a curtalking-currents. rent traverses the helix the strips of soft iron Instead of making both targets movable, 7 5 become magnetized similarly and repel one one of the targets may remain stationary and another, thus causing a relative movement of the other alone be moved through the agency the targets carried upon the ends of the strips of the magnetic field to display the signal. to thereby convey the signal. I preferably Having described my invention, what I arrange the targets so that when the helix is claim as new, and desire to secure by Letters 80 unenergized one of the targets covers and Patent, is-

go hides the other from view, the targets being 1. In an annunciator, the combination with moved apart when the helix is energized to a solenoid or helix, of two bars or strips of uncover the hidden target or disclose both to soft iron extending through the opening or view. The normally-hidden target may alone bore of said helix, and an annunciator target 8 5 possess a distinctive color, so that the signal adapted to be displayed by the relative moveconsists in displaying the color by the removal ment of said strips, substantially as described. of the othervtarget, or both targets may be 2. In an annunciator, the combination with characteristically colored,the signal then cona solenoid or helix, of a pair of thin strips of sisting in the appearance of the contrasting magnetic material mounted at one end in a 0 colors. support and extending through the opening 40 Referring to the accompanying drawings, or bore of said helix, said strips carrying upon Figure 1 is a sectional view of a signal detheir opposite endstargets, one normally vice embodying my invention, the helix becovering and hiding the other from view, said ing unenergized. Fig. 2 is a similar view strips being adapted to be movedtransversely 9 5 showing the helix energized. Fig. 3 is an end when said helix is energized to separate said View of the signal device, the helix being entargets and disclose the normally covered tarergized. get to View; substantially'as described.

Like letters refer to like parts throughout In witness whereoflhereunto subscribe my the several figures. name this 5th day of December, A. D. 1894:-

Upon one end of the solenoidor helix of CHARLES E. SCRIBNER. wire a is provided a block or support I), in Witnesses:

which are mounted the ends of the thin strips ELLA EDLER,

of soft iron 0 d, which extend through the DUNCAN E. VVILLETT. 

